Improvement in combined check and slide valve



J C STEAD Combined Check and Slide-Valve. No. 203,565. Pten-ted May 14,1878'.

UNITED STATES PATENT OEEIoE.

JAMES C. STEAD, OF BROOKLYN, NEW YORK.

IMPROVEMENT IN'COMBINED CHECK AND SLIDE VALVE.

Specification forming part of Letters Patent No. 203,565, dated May 14,1878 application filed March 29, 1878. 4

To all whom it may concern:

Improvements in Combined Check and Slide Valve, of which the followingis a specification:

" My invention consists in hinging a check-.

valve to the end of a sliding valve-stem, whereby at the will of theoperator the check-valve may be opened to allow the passage of a fluidtheretofore prevented from flowin gthrough the chamber by the ordinaryaction of the valve as a check.

My invention includes a device for securing the valve-stem at prescribedpoints, whereby the valve, while freely yielding to pressure in onedirection, may be used to limit the flow in the opposite direction.

My invention is of peculiar value for use in combination with afeed-Water heater and supplementary steam generator, because, inaddition to performing the. ordinary function of a check-valve inpreventingjthe feed-water from entering directly into the boiler, anddirecting it into the feed-water coil, my valve is capable of beingopened, so that, if desired,

the feed-water may be pumped directly into the boiler. The necessity forpumping the feed-water immediately into the boiler may arise from theburning out of a portion of the feed-Water coil. In this connection,therefore, it becomes very important to have a check-valve which iscapable of operation like a hand-valve.

The accompanying drawings, illustrating my improvements, are as follows:

Figure 1 is a central longitudinal section through thevalve chamber andvalve stem. Fig. 2 is a transverse section through the line w w onFig. 1. Fig.3 is a view of the upper portion of the valve-stem andvalve-chamber, showing the check-bar and the set-screw for fastening itin section.

' The drawings represent a valve, the chamber A of which is providedwith an annular shoulder, A, at one end, for engaging the edge of thevalve 13, which is hinged to the lower edge of the sliding valve-stem O.The upper portions of the side walls a a of the valve-chamber areparallel, and space is thus afl'orded for the swinging of the valveupward into the position shown by the dotted lines in Fig. 1. Thevalve-chamber has such depth that the valve, by means of the valve-stem,may be pulled bodily away from its seat, like a slide-valve.

The valve-stem, which is suitably packed in the cap D of thevalve-chamber, is preferably cylindrical, so that it may turn freelyupon its longitudinal axis, and permit the valve, when in position, toact as a check to make a close engagement with all parts of the annularshoulder upon which it is intended to bear.

The valve-stem is provided at its upper end with the cross-piece 0, toone end of which is pivoted the check-bar E. This check-bar may besecured at any desired point by means of a binding-screw, F, in the endof the perforated lug f, through which the check-bar slides, as shown inFig. 3.

The projecting lug f is cast on the outer wall of the valve-chamber, andmay be provided with a vertical perforation, f, to receive thecheck-bar, which slides through it; and it may also be provided with thehorizontal perforation e, to receive the tongues E projecting laterallyfrom the side of the check-bar E.

If desired, two lugs may be cast, respectively, on opposite sides of thevalve-chamber, and two check-bars may be provided, one of which isstraight, and slides in a vertical perforation, f, in the lug providedwith the binding-screw F, while the other check-bar, on the opposite endof the cross-piece 0, may be provided with the lateral tongues E forentering the horizontal perforation in the lug on the opposite side ofthe valve-chamber.

If desired, an expanding spiral spring, G, may be placed upon the upperportion of the ValvestemO, so that the instant the checkbar is detachedfrom the lug the valve-stem will slide upward and open the valve.

What I claim as my invention, and desire to secure by Letters Patent ofthe United States, is-

1. A check-valve hinged upon the end of a sliding valve-stem, and hence,while tending to act as a check in. one direction, adapted to beoperated as a slide-valve for allowing the passage of fluid through thevalve-chamber in the opposite direction.

2. A valve-chamber formed substantially as shown, and avalve hinged to asliding stem rated lugf, provided with the binding-shrew adapted to movein the plane of the valve- F, substantially as and for the purpose(leseat, in combination with a checking device scribed. adapted to holdthe Valve-stem in variable po- 1 sitions, substantially as and for thepurpose JAMES STEAD' set forth. Witnesses:

3. The valve-stem O, cross-bar c, and the DANIEL CAMERON, check-bar E,in combination with the perfol D. B. TREADWELL,

